Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
dinh tai » dinh toai, dinh tri, dinh thi
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
o lang » hoa lang, hoi lang
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((_ lang) or (o lang)) xa hoi. hieu ve cam thuc va dinh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((_ lang) OR (o lang)) xa hoi. hieu ve cam thuc va dinh tai cua tre*.